Calling device



July .9, 1929.

H. F. OBERG FELL CALLING DEVICE Bled June 1, 1925 Patented July 9, 1929.

STATES PATENT OF HERBERT 1E. UBERGFELL, 0F RIVER FOREST, ILLINOIS, .AESIGNOR, BY MESNE ASSIGAF Ill/TENTS, TO AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELA'WARE.

CALLING DEVICE.

Application filed June 1,

The present inven tion relates in general to improiuanems in calling devices, but is particularly concerned with calling devices of the well known dial. type, used at the subscribmrs stations of automatic telephone systems.

Among the objects of the invention are; the construction and design of improved instruction card assemblies or escutcheon plates, as they are sometimes called, for calling devices; and the manufacture of a .tin ger hole dial which has severalv points in 1ts favor over the linger hole dials formerly used on calling devices of the dial type.

it sheet of drawings showing various views of the invention, numbered as Figs. 1-8, inclusive, together with the description which follows, is believed suflicient to enable a clear understanding of the invention.

Tt may be mentioned at this time that a complete showing of a calling device mechanism has not been made, but only that portion. concerned. with the invention has been shown. The invention may be readily applied to most any calling device, but in the disclosure applicant had in view of (loci-g" ll, Patent No. 1.,64l-.2,S22, issued Sept.

Fig. 1 is a perspective of the finger hole dial, locking mechanism and instruction card assembly dismantled.

Fig. 2 is a cross section of the linger hole dial. lei: on line A A of Fig. 1, with the locking member 10 and retaining ring 1 in place.

ll ig. 3 is a top view of the dial with certain parts of the instruction card assembly broken away and the locking tool. in the position it assumes as the instruction card assembly is being locked in place on the finger hole dial.

Fig. 4: shows a modified form of that part of the invention relating to the instruction card assembly. This View has been shown on an enlarged scale in order to bring out the details.

Fig. 5 is a fragmentary cross sectional view, on an enlarged scale, of the retaining ring 1, transparent disk 4, instruction card 5, and retaining disk 6. This figure applies equally well to both modifications and is taken on line BB, Fig. l.

Figs. 6 and 7 show enlarged. fragmentary views of the modification of Fig. 4:, Fig. 6

1925. Serial No. 34,081.

also showing a tool 23 in position to unlock the instruction card assembly of the modification from the finger hole dial. In Fig. 7 the instruction card assembly is shown in unlocked relation to the dial. This is the position, the instruction card assembly assumes just before it is locked to the dial. These views are taken on line CC of Fig. 4-.

, As shown in Figs. 1, 2, 3, and G, the finger hole dial 141: is manufaetured from a blank of thin metal, preferably brass, which is shamped into the form shown. The resultant ring 25 of the dial. 14 serves to strengthen the dial, and insures it against warping. The effect of thickness, providing ample wearing surface, is also obtained in the same manner in the various finger holes. In the stamping operation of the linger holes, as shown in Fig. 6, the bottom edge as well as the top edgeof each linger hole, is made of'a slightly larger diameter so that a smooth wearing surface for the finger of the operator of the dial is insured.

That part of the dial which receives the instruction card assembly is depressed a substantial distance so that the instruction card assembly when in place is substantially flush with the upper surface of the dial. This also tends to further strengthen the finger hole dial. with the result that the finished product is much lighter in weight and at the same time stronger than dials formerly used.

The instruction card assembly comprises a retaining ring 1, a transparent disk it, an instruction card 5, and. a retaining disk 6. The disk 6 co-operates with the retaining ring 1 to hold the disk 4 and card in place. The retaining ring has a curled under portion 22, most clearly shown in lligs. l; and 5, which serves two purposes. It acts as a key to prevent the instruction card 5 being placed in improper fixed relation to the re taining ring, as the instruction. card can only be put in place when the slot 27 is placed'in register with the key 22. The slot 2'? in the transparent disk also registers with the key 22 so that the transparent disk cannot be rotated independent of the retaining ring. The disk 4: and instruction card 5 are suliiciently flexible that they may be plated in the retaining ring in spite of the indentations at and 24 and the inwardly extending part 2. y

i In order to enable the removal of the instruction card assembly as a whole from the finger hole dial, the thin metal retaining disk 6 is provided. 'Notches-8 are cut out of the periphery of the disk 6 and, when the disk is placed adjacent the instruction card 5 in the retaining ring 1, these notches register with the indentations 24 and 2 1 of the retaining ring. The notch cut out ofthe periphery of disk 6 to form the extension or latch member 7 is also of sufficient width to allow the key member 22 toregister with it. The disk 6 is placed in the retaining ring and is then rotated in the proper direction to bring the extension or latch member 7 into the eyelet formed by key 22. This feature of the construction is clearly shown in Figs. 4 and It will readily be apparent that when the disk 6 is turned the notches S are thrown out of register with indentations in ring 1, thereby locking the entire instruction card assembly together as a whole.

The finger hole dial 14 when used on a calling device 01 the construction disclosed in the previously mentioned pending application is secured to the main shaft or the a calling device by a screw 9, shown in Figs.

1 and S. In the present disclosure this screw also holds the locking member 10 in engagement with the depressed surface ot the finger holedial. The screw 9, is provided with a shoulder 15 over which the locking-member 1O fits so that when the screw is drawn up tightly locking member 10 will still be rotatable. The rotation of member 10is limited, however, part being positioned between the two projections 13 and 13'.

As will be observed, when the instruction card assembly is placed in the depression of the dial, preparatory to locking the same in place,'part 3 of the retaining ring is placed in a slot cut in the wall formed by the depressed portion of the finger hole dial. This construction is shown in Fig. 3. This brings the part 2 of the retaining ring 1 slightly to the left of raised stop 13. It should be observed that apart 11, shown in elevation in Fig. 2, ofthe member 10 lies at right angles a to partlOand projects up into the retaining ring 1'. WVhen the'instruction card assembly is in place a tool 20, made of thin material iswedged between the retaining ring and the transparent disk 4 to move the part 30 to the right, through the medium of extension 11, into locking positiomaif'ter which the tool is withdrawn. The, right side of part 3.0'of member 10 is slightly raised so that when member 10 is rotated to the right the To remove the instruction card assembly,*1t is only necessary to place the tool on the opposite side of the part 11 and to then rotate it to the left. In Fig. 1 it will be noted that the disk 4, instruction card 5, and the disk 6 are slightly cut away for a distance, substantially the same as the distance between stops 13 or 13. This is merely done to facilitate the locking and unlocking of the assembly into and out of fixed relation with the dial.

hen the instruction card assembly is in place, the assembly looks the same as Fig. 52 of the previously mentioned pending application.

In the modified form of the invention, shown in Fig. l, the retaining ring 1 is substantially the same as the retaining ring 1, except that no indentations 24L and 24: are provided and the part 3 instead of being bent outward as is the corresponding part 3 of Fig. 1 is bent inward in substantially the same manner as part 2 of Fig. 1, while the part 2 of the modification is substantially the same as part 2 of Fig. 'l. The transparent disk, instruction card, and retaining disk of the modification (o-operate with part 22 and the eyelet tormcd by it in the same manner as the modificatimi shown in Fig. 1. However, these disks and instruction card need not be cut away to provide room for any tool as they are in Fig. '1. Since there are no indentations in (he rctaining ring of the modification, the disk 6 corresponding to disk 6 has no cut out portions 8, but instead has a spring portion ,1 (3 formed by cutting away part of the membcr (3.

The instruction card assembly is assembled together in substantially the same manner as the previously dcscribml instruction card assembly, except that, in the modification, the assembly is held together as a whole by the spring member 16 being rotated, while in a slightly compressed state, under the member 2, the member 18, at the same time, passing through the eyelet tormcd by key 2).

The method of locking the modilicd term of instruction card assembly in place on the finger hole dial will now be taken up. The stops 13 and 13 in the finger hole dial of Fig. 1 are not necessary in the modification, but instead two diametrically oppositely located openings are cut in the dial which are of suflicient size to receive the extension members 2 and 3 of the retaining 1mg when thewhole instruction card asscmbli is placed in the depression provided in the dial. At this time the spring part 16 of the disk 15 is in alignment with the member 2 as shown in Fig. 4 As will be observed from observation of Fig. (i, when the retaining ring is in place the member 2 comes just below the under side of the linger hole dial, and this is also true of the member 3, not shown in Fig. (i. From observation of Fig. 4 it will be noted that the loo lllS

llo

right part of slot 31 and the left part of slot 31 are much narrower than the part in which members 2 and 3 were placed. Now, when the instruction card assembly is turned to the right as far as it will go, the spring 1.6 will remain where it is as it will engage the finger hole dial or that part of the slot 51 in which the part 2 was dropped and, theretore, the disk 6 will not be rotated, but insteadthe retaining ring, the transparent disk, and instruction card will be rotated until member 2 engages the extreme right edge of restricted portion of the slot 31.. Just be'l'ore this happens, however, the member 16 will be released, and as the member 2 moves away spring 16 oil? the disk 6 will swing dmvnward, its one edge engaging the left edge of slot 31 and its other edge engaging the right edge oil? the large portion of slot 31 and the left edge of member 2 of the retaining ring, thereby locking the retaining ring;- against backuuird rotatioi'i and locking 'the instruction card assembly in place on the dial. This moven'ic'nt, it will be noted, :is in a, direction to cause the eyelet 22 to slide ili'urther over the member 18. In Fig. 7 the instruction card assen'ibiy has just been dropped in place in the dialfwhile in Fig. 6 the instruction card assembly has been rotated and the part 16 has locked the same in place.

New, in order to remove this instrrmtion card assembly from the dial, a special tool 23 is required. This tool is placed on the linger hole dial in the manner shown in Fig, 6, and when pried downward. engages spring 16 and elevates it above the opening :in the linger hole dial. While the lever n3 is in. this position it is necessary to rotate the retaining ring to the left until the spring, 16 is again locked on the upper side of member 2, as shown in Fig. 4, atter which the tool may be removed and the retaining ring rotated to the left as far as it will go, after which the instruction card assembly will be again locked. together as awhole and unlocked with. relation to the finger hole dial.

From the foregoing it will be amireciated that appliiant has devised instruction card assemblies which can be readily removed and replaced by authorized persons, but which cannot readily be tampered with by subscriliicrs or persons un'lan'iiliar with the method of gaining accessibility to the instruction card assembly or the calling device. ll urthermore, it will be seen that the co11- structinn incorporates the use of]. a finger hole dial which may be manutactured Very cheaply and which has many points of superiority over linger hole dials of a similar type now on the market. In View of the foregoing facts it is requested that the invention not be considered as limited to the precise disclosure, but that the same be limited only by the Various claims which follow.

\Vhat is claimed is:

1. In an impulse sending device, a finger hole dial, an instruction card assembly comprising a card with a slot cut in one edge of its periphery, a transparent cover also provided with a like slot, a retaining ring having a keyed portion perni'.v 'ng said card and cover to be placed therein only in definite relation thereto, indei'itations in the wall of the said retaining ring and also an eyelet formed in the ring by the keyed portion thcreot, a disk having its periphery cut away at points registering, with the indentations on said ring, said disk provided with a hold inn extension registering; with the eyelet of said ring so that when the said disk is rotated in a certain direction the extension on ters the said eyelet and the cut away portions are moved out of register with the indentations of the ring; to hold the whole together.

2. In an impulse sending device, a finger hole dial, an instruction. card. assembly comprising; a card with a slot cut in one edge (it its periphery, a transparent cover also provided with a. like slot, a retaining ring having; a keyed portion permitting said card and cover to be placed therein only in definite relation thereto, indentations in the wall of the said retaining ring and also an eyelet formed in, the ring by the keyed portion thereof, a disk having its periphery cut away at points registering with the ll'ltltlitiltiOIlS on said. ring, said disk provided with a holdin extension, registering with the eyelet of said ring so that when the said. disk is rotated in a certain direction the extension ei'iters the said eyelet and the cut away portions are moved out of register with the indentations ot the ring to hold the whole together, and means for locking said instruction card assembly on the dial.

3. In combination with a linger hole dial. and an instruction card assembly, mechanism for locking the dial and card assembly together, said mechanism including a latch pivotally-secured to the dial and hidden. from view when the parts are in place.

4- In an impulse sending device, a finger hole dial, an instruction card asseiinbly, mechanism for locking them together, said mechanism. hidden from view when the parts are in place, and a SllleClftlly constructed tool for disassociatin the assembly from the dial while maintaining the instruction card assen'ibly intact.

5. In. an. impulse sending device, a. finger hole dial, an instruction card asseml'ily, mechanism tor locking them together, said mechanism hid den from view wl. in the parts are in place, and a specially constructed tool for operating said mechanism to both lock and unlock said mechanism.

6. In an impulse transmitting device, a

finger hole dial, an instruction card assembly, and a locking device pivotally secured to the dial for locking the instruction card assembly into fixed relation to the dial.

7. In an impulse transmitting device, a finger hole dial, an instruction card assembly, a locking devicepivotally secured to the dial for locking theinstruction card assembly into fixed relation to the dial, and means for operating said locking device.

8. In combination with a finger hole dial and an instruction card assembly, means for locking the two together consisting of lugs on the instruction card assembly one of which is inserted in an opening in the dial, and of a latch rotatably secured to the dial cooperating with the other.

9. In combination with a finger hole dial and an instruction card assembly, means for locking the two together consisting of two lugs diametrically disposed on said instruction card assembly and both having their free ends extending in the same direction, together with cooperating means on the dial consisting in one instance oi a perforation and in the other of a rotatable member pivoted on and concentric with the dial.

10. In a locking mechanism for locking an instruction card assembly in fixed relation to a rotatable member having a. depression therein for receiving the assembly, two diametrically disposed lugs on the outer periphery of the assembly one cooperating with a perforation in the wall formed by the depression of the member to act as a hinge and anchor at one point, and a latch pivotally secured to the member cooperating with the other lug to securely anchor the other side of the assembly to the member.

11. In combination with an instruction card assemblyprovided with a support havinga depression therein for receiving said assembly, means for locking the assembly to the support including lugs on the assembly and a cooperating rotatable member secured to the support at the base of the depression.

12. A dial for an impulse transmitting device, consisting of a flat, thin circular piece of metal the outer edge of which is pressed normal to the surface of the dial, a plurality of finger holes formed in the dial adjacent to the edge thereof, the inner edges oi. the holes being pressed normal to the surlace of the dial, the central portion of the dial being pressed to lie in a plane parallel to the plane of the outer plane portion and spaced therefrom, said depression being provided with projections, an instruction card. assembly arranged to be inserted into said depression and provided with means arranged 1o eooperate with said projections for locking said assembly to said dial.

13. In combination with a finger hole dial and instruction card assembly, a depression in the dial for receiving the assembly, said depression provided with projections, and means arranged to co-operate with said. projections for locking the assembly in said depression.

14. In combination with a finger hole dial and an instruction card assembly, means for locking the two together, consisting oil? :1 lug on the instruction card assembly, and oil? a latch co-operating with said lug.

15. In combination with a linger hole dial provided with a depression for housing an instruction card assembly, a locking device pivotally attached to the dial for eo-operating with said assembly to hold it in place.

In witness whereoi,I hereunto subscribe my name this 26th day of May, A. D. 1925.

HERBERT F. OBERGFELL. 

